Just downloaded the NFL Collective Bargaining Agreement ("CBA"). Here are the rules for the Practice Squad:
Article XXXIV of the CBA: Teams may have eight practice squad players. A team cannot simply assign a fringe player to the practice squad. He must first be waived and go unclaimed by another club. The player then would become a free agent, not bound to sign a practice squad deal.
Players must meet one of the following criteria while previously not being on a practice squad more than two seasons:
- No accrued seasons of NFL experience.
- Free agents who were on an active roster for fewer than nine regular-season games during their accrued seasons.
- A season on the practice squad constitutes three weeks.
- A practice squad player remains free to sign with any other club, but once signed must remain on the new team's 53-man roster unless cut.